Continuity mistake: When Walter takes Junior home from school, at first there are no shadows or sun hitting the ground in front of the garage. In the next shot the sun appears.
Audio problem: When Walt yells at Jesse through the lab's entrance door, the sound is very muffled, as if the door is a major insulator of sound. However, later, when Jesse yells at Walt through the same door, the sound is much clearer, and hardly muffled at all. (00:22:15 - 00:23:55)
Visible crew/equipment: In the scene after Walter took his son from the school and parks his car in front of their house (before the pizza scene), you can see the camera mounted on a crane while filming the scene reflected on the car's windscreen.
Green Light - S3-E4
Other mistake: The ATM video from the gas station in the desert should have shown Jesse and not just the RV.
Continuity mistake: As Walt is talking to Saul in his classroom, there is a pen under the desk by the chair leg Walt is standing by. It is next to the chair's front left leg. A few moments later without being hit, the pin moves to the front right leg.
Continuity mistake: When Walt is practicing his pistol draw in his apartment, he drags over a chair in which to sit during his practice. When he is dragging it, he aligns it directly against the carpet. However, a few seconds later, another shot shows that the chair is now inches away from the carpet, despite him never adjusting the chair.
Hazard Pay - S5-E3
Continuity mistake: Skyler's salad at the car wash changes during the sequence. She gains pieces of lettuce after she starts yelling "shut up."
One Minute - S3-E7
Continuity mistake: The man with the bulletproof vests is against the boxes in pain. In the closer shot, he takes his hat off. Cut to a wider shot, his hat is back on. (00:24:58)
Green Light - S3-E4
Continuity mistake: Schrader is pulled along side a road and receives a phone call about El Paso. The sky goes from being overcast to fairly clear between the different angles.
Audio problem: The message from Walt that Skyler listens to at the office is different from the audio earlier in the episode. Walt says "no" when we see him, but on the recording he doesn't say it.
Continuity mistake: The candles on the cake at the party change height a few times during the sequence.
Crawl Space - S4-E11
Continuity mistake: In the opening scene, the medical team is treating Gus. The oral syringe of medication is drawn to "1", in the next scene, it is completely full when the man administers the drug. (00:01:20)
To'hajiilee - S5-E13
Continuity mistake: Out in the desert, Hank yells at Walt to drop his gun. Walt, in a frontal shot, extends his arm out to his side and lets the gun drop. When it changes to a low angle from behind Walt, suddenly this same arm and hand are down at his side instead of extended out.
Continuity mistake: In the car when Walt meets up with Saul and discusses "Old Yeller" Walt asks what he means and is looking at Saul. When it cuts to a close up of Walt, he's suddenly looking more straight ahead or towards the driver, only then to turn his face to Saul.
Continuity mistake: After Gus goes to the restroom, there's a shot of the cartel leader smoking a cigar as he turns to look at Jesse. The cigar is burnt down nearly to the band around it where his fingers are. When it cuts to a different angle to him taking it out of his mouth, suddenly there is much more cigar left above that band.
Problem Dog - S4-E7
Continuity mistake: After Walt makes the ricin poison and Jesse is holding it in the little vial, the position Jesse is holding it changes between shots. Holding it in one hand up looking at it from side angles, to the front angle view him holding it more outstretched and in both hands.
Continuity mistake: After Walt and Junior are about to go see Hank's mineral collection, Hank's front door is still open. The camera cuts to Hank for a moment as he turns his wheelchair to move down the hall and Walt and Junior soon follow. In the next shot, suddenly the front door has closed by itself. There was not enough time for Walt to have closed it and it would have been heard if he did.
Box Cutter - S4-E1
Continuity mistake: At the Denny's, when Jesse says "Him and us, we get it" he reaches down with his right hand and picks up his knife. Sitting on the plate next to his knife is his fork. But in the next shot, suddenly his fork is in his left hand.
Continuity mistake: In the car driving after seeing Saul, Skyler tells Walt "This is what happens when you decide to pay the bills with drug money" The shot from behind shows Walt's head completely in the shadows. When it cuts to a closer angle, suddenly he has light around his head and part of his neck with only a small shadow cast on him.